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Project Acura NSX Part 3, Building a Race Proven C32 Engine

Sarah Forst posted on October 28, 2009 16:21

The FX Motorsports Development crank is machined from a block of 4340 billet high nickel steel. The crank has generous rolled fillets for strength and cross drilled oil passages. The crank is shot peened and has the oil holes chamfered and teardroped. The bearing journals are micropolished and the crank is WPC treated for fatigue strength improvement and friction reduction. The crank uses the stock 78mm C32 stroke.

The milky texture of the bearing surface is the result of the WPC treatment. You can see the generous chamfer of the fillets at the edge of the journal . The fillet is important for the long term durability of any crankshaft.

You can see the pebbled texture of the shotpeening here. The oil passage plugs are positive screw in type, typical for racing applications. The crank spins in stock C32 bearings.

FX Motorsports Development modifies the oil pump by machining the housing for this deeper larger set of gears that gives the oil pump higher volume. The gears are WPC treated.

The entire reciprocating assembly show here. The rods are Crower billet H beam parts with high strength bolts. The rods are made of 4340 billet and are shotpeened for improved fatigue strength.

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Posted in: Magazine, Tech, Engine, Project Cars, Acura, Project NSX

Actions: E-mail | Permalink | Comments (10)

Comments

# Fuji-Kun

Friday, October 30, 2009 7:14 PM

i love you guys. i really miss having these tech articles in print. 3 stories about engine work in one page. and it is not hard to read at all. it just flows. i love this site and i love you guys and girls. thanks you again motoiq!!!

# saturn racer

Saturday, October 31, 2009 7:54 AM

Why no additional displacement? That'd also help spool the turbo for better response.

# Jerk Face

Monday, November 02, 2009 6:38 AM

Totally agree with Fuji-Kun. This kind of fantastic automotive writing is something I've really been missing!

# Mike Kojima

Monday, November 02, 2009 8:04 AM

This engine is built for durability, so no long stroke, too high piston speed, thick cylinder walls for support, cooling and ring seal so no big bore.

This bottom end runs at over 750 hp for 20-30 minutes at a time flat out in Time Attack. Not 10 seconds down the quarter or 30 seconds to a minute in a freeway blast.

# JDMized

Wednesday, November 04, 2009 4:56 PM

Excellent post (as usual).
But I am surprised you guys still run a wet sump ! If reliability is a key factor (which it is), dry sump should ring a bell. Any reason why you guys haven't considered that?
Dry sump are expensive to piece together, but considering the fact that the FX MD is dominating the Redline Time Attack series, it's a no brainer to me.
I'm curious to know why you guys haven't opted for one.
Any thought?
Thanks again for the excellent articles.

# Mike Kojima

Wednesday, November 04, 2009 6:57 PM

The engine on the time attack car uses a semi dry sump. Two engine driven pumps scavenge the pan which feeds to a tank, de aerator. A modified stock pump then feeds the engine.

This packages easier in the NSX.

For this street car, the modded pan will be used with an accsump.

# stuntman

Friday, November 06, 2009 7:29 PM

Saturn Racer: The block was originally a 3.0L C30A which was punched out to 93mm bore which equates to 3.2L (same displacement as the C32B). Increasing the bore further can increase displacement but there isn't much room to keep a sufficient wall thickness of the sleeve.

Piston speeds start to go through the roof as well as the thrust against the cylinder walls with a stroker kit. The stock 78mm stroke combined with our turbo sizing on the FX750 racecar results in an already broad powerband.

Stay tuned for future articles where turbo sizing for our power levels will be covered that will ensure a very responsive setup.

Billy

# M-P

Monday, November 16, 2009 2:58 PM

Reading these articles about the project NSX makes me wish I could go back in time a few years and save the money I spent making my FD RX-7 my track car so that I could have put it into my NSX instead. I'm looking forward to the rest of the NSX build...thanks for the good read.

# DaGou

Monday, December 05, 2011 7:33 PM

anybody know why this project died?

# stuntman

Saturday, March 10, 2012 11:39 AM

DaGou: it will be up and running again soon with a rebuild of the head and longblock assembly.

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